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SENT BY. XEROX Telecopier 7017, 7- 7-94 ; 16:19 41536492331 12098383509,# 2 <br /> ,—!D— Sequoia 660 Chempeake Drive Redwood City,CA 9406s (413) 164-9600 FAX(415)364 9233 <br /> qW /� 1900 Bates Avenue,Sults L Concord,CA 94520 (310) 686-9600 FAX(Std)6116 9689 <br /> Analytical B19 Striker Avenue,suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921 0100 <br /> .V�SrZ, <br /> �rolect 150 141 01 n oaquin 0 Main Street Matrix Solid <br /> {Escalon, CA 95320, <br /> Attention, Greg Stahl OC Sample Group 4FI7401-02 Reported Jun 23, 1984 # <br /> , <br /> QUALITY CONTROL DATA REPORT <br /> ' ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> ' Method. EPA 5020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst., C Donohue C Donohue C Donohue C Donohue <br /> MS/MSD <br /> ' Batch#: 4F13902 4F13902 4F13902 4FI3802 <br /> Data Prepared: 6/6/94 E/e/94 6/6/94 6/e/94 <br /> Data Analyzed., 8/8/64 e/6/e4 8/8/94 6/6/94 <br /> ' Instrument I.D.#: aCHP67 GCHR7 GCHP T GCHP-7 <br /> Cono Spiked: 10Mg/L 10pp/L 1ogg/L 30lrg/1. <br /> Matrix Spike <br /> %Recovery: 90 as go 91 <br /> Mattis Spike <br /> ' Duplicate% <br /> Recovery. 100 110 110 103 <br /> Relative% ' <br /> ' Difference: 10 11 11 6.0 <br /> 1 _LCS Batch#: <br /> s <br /> ' Date Prepared: <br /> Date Analyzed: _ 4 <br /> Instrument I D.#: _ <br /> ' LCS% - - • - <br /> Recovery: <br /> ' %Recovery <br /> Control Limits: 71-136 72-128 72-130 71-120 <br /> Plea se Note <br /> The LCS Is a control Sample of known,Interferent free matrix that Is analyzed using the same ree4onts, <br /> SEQUOIA ANALYTICAL preparation,and analytical Methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known qua"41198 of apecrtlo compounds and subjected to the entire:analytical procedure k <br /> qp WTI—C&L-� the recovery of analytes from the matrix spike does not fall within specified control Ilritits due to matrix <br /> Vickie Tagus Clark Interference,the LOS reoovely Is to be used to validate the batch <br /> project Manager 4F17401 WAT <2a <br />